地下水渗流中高铁酸钾氧化去除石油烃类污染物的试验研究

Test Study on Removal of Petroleum Hydrocarbon Contaminants by Oxidation of Potassium Ferrate in Groundwater Seepage

本文通过模型试验,采用0#柴油模拟石油烃类有机污染物,研究了在低弥散混合强度的弱碱性地下水渗流中,高铁酸钾完全氧化分解低浓度石油烃类有机物的过程。研究同时以高强度搅拌近似完全混合状态的烧杯试验为参照,对比分析低混合强度的渗流中石油烃类污染物的氧化速率和完全氧化率。试验研究显示,在过量高铁酸钾存在的条件下,在模型试验设定的一般渗流工况,石油烃类有机物的完全氧化率平均达到88.26%,约低于烧杯中在完全混合状态的完全氧化率89.40%,直链烃类、一环烷烃等组分都能被氧化分解,残余物主要为多环芳香烃类。氧化反应过程中的pH值变化受小分子有机酸累积的影响,但仍能保持在一般地下水pH的变化幅度范围内。渗流试验模型中弥散的混合强度低,石油烃类有机污染物完全氧化反应速率明显低于烧杯中完全混合工况的一级反应,且氧化反应的时间较长。

This paper studied the process of complete oxidation and decomposition of low concentration petroleum hydrocarbon organic compounds by potassium ferrate in low-dispersion mixed-water weak alkaline groundwater seepage through a model test,by using 0#diesel to simulate petroleum hydrocarbon organic pollutants.At the same time,a beaker test with high-intensity agitation to modulate complete mixing was used as a reference to analysis oxidation efficiency and oxidation rate of petroleum hydrocarbon pollutants.The test study showed that in the presence of excess potassium ferrate,the average oxidation rate of petroleum hydrocarbons was about 86.90%in the general seepage conditions set in the model test,lower than the oxidation rate 89.46%of the beakers test with complete mixed.The linear hydrocarbon,naphthenes Hydrocarbon components could be oxidized,and the residues were mainly polycyclic aromatic hydrocarbons.The pH change during the oxidation reaction was affected by the accumulation of small organic acids,but it could still be kept in the range of ordinary changes of groundwater.The mixing intensity of dispersion in the seepage test model was lower,and the complete oxidation reaction rate of petroleum hydrocarbon organic pollutants was significantly lower than that of the first order reaction with complete mixing of beaker,and the oxidation reaction took more time.